Millstone-dress



,n i l.. D

UNITED STATES PATENT OFFICE.

THOMAS H. BALE, OF PETERSBURG, ILLINOIS.

M I LLSTONE-DRESS.

SPECIFICATION forming part of Letters Patent No. 233,132, dated October 12, 1880.

' Application led May 7, 1880. (No model.)

To all whom t may concern:

Be it known that I, THOMAS H. BALE, of Petersburg, in the county of Menard and State of Illinois, have invented certain new and useful Improvements in Millstone-Dresses; and I do hereby declare the following to be full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same,

1o reference being had to the accompanying drawings, and to letters ot' reference marked thereon, which form a part of this specification.

It is known that the best mode of producing a superior grade of flour is by rst reduc- I 5 ing the grain into middlings, and then grinding the middlings (after being purified) into flour; and the main object to be accomplished lin milling is to produce the greatest quantity of middlings without iouring,I the grain on 2o the lirst grinding, and yet to clean the bran sufficiently to render the regrinding of same unnecessary.

The object ot my invention is to accomplish these results 5 and the nature of my peculiar 2 5 style of dress for millstones will clearly be seen from the following description and claims.

Referring to the drawings, Figure l is a plan view of my improved millstone-dress. Fig. 2 is a sectional face of the small portion 3o cut from the millstone by the line a' a: of Fig. 1. Fig. 3 is a perspective view of aportion of the millstone-dress; and Fig. 4 is a detail sectional view of a modilication of my improved dress.

Corresponding parts in the several figures are denoted bysimilar letters ot reference.

In the annexed drawings, A marks the tangential leading furrows, extending from the eye to the skirt of the stone, and c a the sec-- 4o ond and third furrows, respectively, which branch from the leading furrows, all cut in the usual manner.

`The peculiar construction of the grindingsurface divided by the furrows, and which are 4 5 termed landsf constitutes the subject-matter of my invention. These lands are each formed ot a narrow high portion or plane, b, which is iiush or even with a line marking the face of the stone, and a reduced or depressed portion 5o or plane, b', parallel to but lower than said high portion b, as clearly shown in Figs. 2 and 3.

The high portion b, it will be seen from the drawings, is next to the back of the furrow, and the reduced or depressed portion b ot' the 55 land is between said high portion and the feather-edge of the furrows.

It will be further observedthat the lands, composed of the high portion b and reduced or depressed portion b ,like the furrows, are evenly 6o and regularly arranged on the face of the stone, and the lands next to the leading furrows A extend, like said furrows, from the eye to the skirt of the stone.

The upper and lower stone are dressed in the manner described, or the lower stone alone may be so dressed.

In the ordinary dress having wide high lands the stones must be run far apart to prevent ilouring, in which event the crushed grain 7o is discharged without cleaning the bran or to clean the bran the stones must be run near together, which will flour the middlings. With my dress the grain, as it enters the eye of the upper stone, is crushed, and the high parts of lands being arranged close together, the bran passes over said high parts and is cleaned of the rich iner inddlings, while the bulk of the middlings is made upon and by the reduced or depressed portion of lands and discharged. 8o at the skirt ot' the stone. The high portion of the lands is aloneintended to thoroughly clean the bran. The reduced or depressed portion of the lands is made deeper or shallower, as desired,to make the middlings coarser or finer. 8 5

By my mode of dressing the stone or stones enough middlings can be produced from one pair of stones to constantly feed another or tlouring-stone, which grinds the middlings into flour. By the old style of dress it requires 9o two or more pairs ot stones to supply iniddlings for one liouring-stone.

Fig. 4 shows a modification ot my dress, in which, instead of arranging the high portion ot' the lands next to the back of the furrows, the reduced or depressed portion is so arranged.

Having thus fully described my invention, what I claim, and desire to secure by Letters Patent, is

1. A millstone having its grinding-surface roo :md plane b, substantially-ais shown, and as and for the purposes set forth.

In testimony that I claim the foregoing I have hereunto set my hand this 20th day of April, 1880.

THOMAS H. BALE.

Witnesses AARON IIATFIELD, E. A. MoRPIIEN. 

